Plot hole: Why doesn't Chris ever use his powers against demons? We know he can use them in this time, since he blows up Leo in "Oh My Goddess" and kills a Valkyrie in "Valhalley of the Dolls", and after "Chris-Crossed", when it was discovered he was half-witch he had no reason to hide them from the sisters, yet he never once used them against a demon, even when one of the Charmed ones is in mortal danger.

Suggested correction:Actually Chris couldn't use his powers up until the "Chris-Crossed" episode because before this episode the sisters couldn't find out that he was part witch because then his cover as just their whitelighter would have been blown. Basically he had to keep his powers a secret until the "Chris-Crossed" episode.